2505649 has 4 divisors (see below), whose sum is σ = 2511360. Its totient is φ = 2499940.

The previous prime is 2505641. The next prime is 2505673. The reversal of 2505649 is 9465052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2505649 - 2³ = 2505641 is a prime.

It is a super-2 number, since 2×2505649² = 12556553822402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2505649.

It is not an unprimeable number, because it can be changed into a prime (2505641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2137 + ... + 3094.

It is an arithmetic number, because the mean of its divisors is an integer number (627840).

2^2505649 is an apocalyptic number.

It is an amenable number.

2505649 is a deficient number, since it is larger than the sum of its proper divisors (5711).

2505649 is an equidigital number, since it uses as much as digits as its factorization.

2505649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2505649 is about 1582.9241927521. The cubic root of 2505649 is about 135.8230288979.

The spelling of 2505649 in words is "two million, five hundred five thousand, six hundred forty-nine".